Bipolar Junction Transistor Amplifiers MCQ Boylestad Test Prep
1. Which of the following techniques can be used in the sinusoidal ac analysis
of transistor networks?
A) Small-signal
B) Large-signal
C) Small- or large-signal
D) None of the above: C
2. What is the limit of the efficiency defined by = Po/Pi?
A) Greater than 1
B) Less than 1
C) Always 1
D) None of the above: B
3. Which of the following define(s) the conversion efficiency?
A) Ac power to the load/ac input power
B) Ac power to the load/dc power supplied
C) Dc output power/ac input power
D) All of the above: B
4. Which of the following should be done to obtain the ac equivalent of a
network?
A) Set all dc sources to zero
B) Replace all capacitors by a short-circuit equivalent.
C) Remove all elements bypassed by the short-circuit equivalent.
D) All of the above: D
5. The model suffers from being limited to a particular set of operating
conditions if it is to be considered accurate.
A) hybrid equivalent
B) re
C) ²
D) Thevenin: A
6. The model fails to account for the output impedance level of the
device and the feedback effect from output to input.
A) hybrid equivalent
B) re
C) ²
D) Thevenin: B
7. Which of the following is (are) true regarding the input impedance for
frequencies in the midrange d100 kHz of a BJT transistor amplifier?
A) The input impedance is purely resistive.
B) It varies from a few ohms to mega ohms.
C) An ohmmeter cannot be used to measure the small-signal ac input imped-
, Bipolar Junction Transistor Amplifiers MCQ Boylestad Test Prep
ance.
D) All of the above: D
8. Which of the following is (are) true regarding the output impedance for
frequencies in the midrange d100 kHz of a BJT transistor amplifier?
A) The output impedance is purely resistive.
B) It varies from a few ohms to more than 2 M.&
C) An ohmmeter cannot be used to measure the small-signal ac output imped-
ance.
D) All of the above: D
9. What is the range of the current gain for BJT transistor amplifiers?
A) less than 1
B) 1 to 100
C) above 100
D) All of the above: D
10. The input impedance of a BJT amplifier is purely in nature and can
vary from a few to .
A) resistive, ohms, megohms
B) capacitive, microfarads, farads
C) inductive, millihenrys, henrys
D) None of the above: A
11. For BJT amplifiers, the gain typically ranges from a level just less
than 1 to a level that may exceed 1000.
A) voltage
B) current
C) impedance
D) All of the above: B
12. What is the unit of the parameter ho?
A) Volt
B) Ohm
C) Siemen
D) No unit: C
13. Which of the h-parameters corresponds to re in a common-base configu-
ration?
A) hib
B) hfb
C) hrb
D) hob: A
14. What is the range of the input impedance of a common-base configura-
tion?
1. Which of the following techniques can be used in the sinusoidal ac analysis
of transistor networks?
A) Small-signal
B) Large-signal
C) Small- or large-signal
D) None of the above: C
2. What is the limit of the efficiency defined by = Po/Pi?
A) Greater than 1
B) Less than 1
C) Always 1
D) None of the above: B
3. Which of the following define(s) the conversion efficiency?
A) Ac power to the load/ac input power
B) Ac power to the load/dc power supplied
C) Dc output power/ac input power
D) All of the above: B
4. Which of the following should be done to obtain the ac equivalent of a
network?
A) Set all dc sources to zero
B) Replace all capacitors by a short-circuit equivalent.
C) Remove all elements bypassed by the short-circuit equivalent.
D) All of the above: D
5. The model suffers from being limited to a particular set of operating
conditions if it is to be considered accurate.
A) hybrid equivalent
B) re
C) ²
D) Thevenin: A
6. The model fails to account for the output impedance level of the
device and the feedback effect from output to input.
A) hybrid equivalent
B) re
C) ²
D) Thevenin: B
7. Which of the following is (are) true regarding the input impedance for
frequencies in the midrange d100 kHz of a BJT transistor amplifier?
A) The input impedance is purely resistive.
B) It varies from a few ohms to mega ohms.
C) An ohmmeter cannot be used to measure the small-signal ac input imped-
, Bipolar Junction Transistor Amplifiers MCQ Boylestad Test Prep
ance.
D) All of the above: D
8. Which of the following is (are) true regarding the output impedance for
frequencies in the midrange d100 kHz of a BJT transistor amplifier?
A) The output impedance is purely resistive.
B) It varies from a few ohms to more than 2 M.&
C) An ohmmeter cannot be used to measure the small-signal ac output imped-
ance.
D) All of the above: D
9. What is the range of the current gain for BJT transistor amplifiers?
A) less than 1
B) 1 to 100
C) above 100
D) All of the above: D
10. The input impedance of a BJT amplifier is purely in nature and can
vary from a few to .
A) resistive, ohms, megohms
B) capacitive, microfarads, farads
C) inductive, millihenrys, henrys
D) None of the above: A
11. For BJT amplifiers, the gain typically ranges from a level just less
than 1 to a level that may exceed 1000.
A) voltage
B) current
C) impedance
D) All of the above: B
12. What is the unit of the parameter ho?
A) Volt
B) Ohm
C) Siemen
D) No unit: C
13. Which of the h-parameters corresponds to re in a common-base configu-
ration?
A) hib
B) hfb
C) hrb
D) hob: A
14. What is the range of the input impedance of a common-base configura-
tion?
